none, Add new 3-car garage, replace , Studies & Reportsy � INCORPORATED JANUARY 24, 1957
NO.2 PORTUGUESE SEND ROAD
ROLLING HILLS, CA 90274
(310) 377--1521
FAX (310) 377-72
:,:
GEOTECH ICAL HAZARDS
INFORMATION SHEET
For information regarding building requirements for properties located in areas designated
as geotechnical hazards, please see the attached section of the County of Los Angeles
Building Code.
For further information, please contact
Los Angeles County
Geology Division _
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Information provided by:
City of Rolling Hills Planning Department
Yolanta Schwartz
Planning Director
Phone: 310-377-1521
Email: ys@cityofrh.net
ADMINISTRATION
4. If design flood elevations are not included on the
community's Flood Insurance Rate Map (FIRM),
the Building Official and the applicant shall obtain
and reasonably utilize any design flood elevation
and floodway data available from other sources;
5. Upon placement of the lowest floor, including base-
ment, and prior to further vertical construction, the
Building Official shall require submission of docu-
mentation, prepared and sealed by a registered
design professional, of the elevation of the lowest
floor, including basement.
110.1.2 Portions of the unincorporated territory of the
County of Los Angeles subject to severe flood hazard by
reason of inundation, overflow, erosion or deposition of
debris are established as floodways by Chapter 11.60 of
Title 11 of the Los Angeles County Code. Whenever refer-
ence is made to any floodway in such ordinance establish-
ing floodways, it shall be construed to mean a floodway
referred to in this Section. A person shall not perform
work for which a building or grading permit is required
within the boundaries of an established floodway if such
work increases the flood hazard to adjacent properties by
either increasing the capital flood water surface elevation,
deflecting flows or increasing bank erosion. Such work
may be performed within an established floodway, and a
building or grading permit therefor may be issued, where
provisions are made to the satisfaction of the Building
Official to avoid such an increase in the flood hazard.
A 110.2 Geotechnical hazards.
A 110.2.1 No building or grading permit shall be issued
A under the provisions of this Section when the Building
L Official finds that property outside the site of the proposed
L work could be damaged by activation or acceleration of a
A geotechnically hazardous condition and such activation or
A acceleration could be attributed to the proposed work on,
L or change in use of, the site for which the permit is
L requested. For the purpose of this Section, a geotechni-
A cally hazardous condition does not include surface dis-
A placement due to earthquake faults.
A 110.2.2 Except as provided in Section 110.2.3, work
A requiring a building or grading permit by this Code is not
L permitted in an area determined by the Building Official to
L be subject to hazard from landslide, settlement or slippage.
A For the purpose of this Section, landslide, settlement or
A slippage does not include surface displacement due to
A earthquake faults.
L 110.2.3 Subject to the conditions of Section 110.2.1, per-
L mits may be issued in the following cases:
L 110.2.3.1 When the applicant has submitted an engi-
L neering geology and/or soils engineering report or
A reports complying with the provisions of Section 111
A such that said reports show to the satisfaction of the
L Building Official that the hazard will be eliminated
L prior to the use or occupancy of the land or structures.
L 110.2.3.2 When the applicant has submitted an engi-
A neering geology and/or soils engineering report or
A reports that comply with the provisions of Section 111,
L .
and that demonstrate to the satisfaction of the Building
Official, that the site is safe for the intended use.
110.2.3.3 When the proposed work involves the alter-
ation or repair of existing structures and the cost of
such alteration or repair does not exceed 25 percent of
the current market value of the existing structure, such
value to be based on assumed continuation of the estab-
lished legal use. Before a permit may be issued pursu-
ant to this Section, the owner shall do all of the
following:
1. If required by the Building Official, submit an
engineering geology and/or soils engineering
report or reports that contain(s), at a minimum, a
qualitative and/or conditional finding that the
proposed work complies with the provisions of
Section 110.2.1.
2. Record in the office of the Department of Regis-
trar -Recorder, a statement that the owner is aware
that the records of the Building Official indicate
that the property is potentially subject to hazard
from landslide, settlement, or slippage.
3. Record in the office of the Department of Regis-
trar -Recorder, an agreement relieving the County
and all officers and employees thereof of any lia-
bility for any damage or loss which may result
from issuance of such a permit. This agreement
shall provide that it is binding on all successors in
interest of the owner and shall continue in effect
until the Building Official records in the office of
the Department of Registrar -Recorder a state-
ment that the Building Official has determined
that such hazard from landslide, settlement or
slippage no longer exists. The repair work shall
consist of restoring the original construction. The
Building Official may require that provisions be
made in anticipation of future settlement. For the
purposes ,of this Section 110.2.3.3, "alteration"
does not include an addition or additions.
110.2.3.4 When the proposed work involves an addi-
tion or additions to an existing structure but is not a
change in use or occupancy and such work does not
increase the gross floor area of the structure by more
than 25 percent of the area of the structure as it existed
on July 6, 1968, and the Building Official determines
that the proposed work will not impact a historically
active landslide. Before a permit may be issued pursu-
ant to this Section, the owner shall do all of the follow-
ing:
1. Submit an engineering geology and/or soils engi-
neering report or reports that contain(s), at a min-
imum, a qualitative and/or a conditional finding
that the proposed work complies with the provi-
sions of Section 110.2.1.
2. Record in the office of the Department of Regis-
trar -Recorder the finding of such report or
reports.
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2017 COUNTY OF LOS ANGELES BUILDING CODE
2016 CALIFORNIA BUILDING CODE
ADMINISTRATION
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3. Record in the office of the Department of Regis-
trar -Recorder an agreement relieving the County
and all officers and employees thereof of any lia-
bility for any damage or loss which may result
from the issuance of such a permit. This agree-
ment shall provide that it is binding on all succes-
sors in interest of the owner and shall continue in
effect until the Building Official records in the
office of the Department of Registrar -Recorder a
statement that the Building Official has deter-
mined that a hazard from landslide, settlement, or
slippage no longer exists.
This Section shall not apply to structures con-
structed after July 6, 1968.
110.2.3.5 When the proposed work involves the repair
of a single-family residence or accessory structures
where the cost of such repair exceeds 25 percent of the
current market value of the existing building.
The scope of the repair work shall be subject to the
approval of the Building Official. Before a permit may
be issued pursuant to this Section, the owner shall do
all of the following:
1. Submit an engineering geology and/or soils engi-
neering report or reports that contain(s), at a min-
imum, a qualitative and/or conditional finding
that the proposed work complies with the provi-
sions of Section 110.2.1 of this Code.
2. Record in the office of the Department of Regis-
trar -Recorder a statement by the owner acknowl-
edging that the records of the Building Official
indicate that the property is potentially subject to
hazard from landslide, settlement, or slippage.
3. Record in the office of the Department of Regis-
trar -Recorder an agreement relieving the County
and all officers and employees thereof of any lia-
bility for any damage or loss which may result
from issuance of such a permit. This agreement
shall provide that it is binding on all successors in
interest of the owner and shall continue in effect
until the Building Official records in the office of
the Department of Registrar -Recorder a state-
ment that the Building Official has determined
that such hazard from landslide, settlement, or
slippage no longer exists.
110.2.3.6 When the proposed work involves the
replacement of structures destroyed by causes other
than landslide, settlement, or slippage, and the permit
applicant was the owner of the property at the time of
the loss, their immediate heir(s), or their authorized
representative, and the application for a permit under
this Section is filed no later than ten (10) years follow-
ing the date of the loss.
The replacement structure(s) shall not exceed the
area, number of stories, load, or number of fixtures and
bedrooms of the structure that was destroyed. No
change in occupancy type shall be permitted. Before a
permit may be issued pursuant to this Section, the
owner shall do all of the following:
1. Demonstrate, to the satisfaction of the Building
Official, that the replacement structure and/or the
associated private sewage disposal system (if
any) and/or the replacement landscaping (if any)
will not result in a greater amount of groundwater
infiltration than occurred under the original con-
dition.
2. Submit an engineering geology and/or soils engi-
neering report or reports that contain, at a mini-
mum, a qualitative and/or conditional finding that
the proposed work complies with the provisions
of Section 110.2.1 of this Code and that contain
recommendations for enhancing the stability of
the site.
3. Record in the office of the Department of Regis-
trar -Recorder a statement by the owner acknowl-
edging that the owner is aware that the records of
the Building Official indicate that the property is
potentially subject to a hazard from landslide,
settlement, or slippage.
4. Record in the office of the Department of Regis-
trar -Recorder an agreement relieving the County
and all officers and employees thereof of any lia-
bility for any damage or loss which may result
from issuance of such a permit. This agreement
shall provide that it is binding on all successors in
interest of the owner and shall continue in effect
until the Building Official records in the office of
the Department of Registrar -Recorder a state-
ment that the Building Official has determined
that such hazard from landslide, settlement, or
slippage no longer exists.
110.2.3.7 When the proposed work involves a one-
story, detached, light -framed structure not intended or
used for human occupancy, such as a garage, carport,
patio cover, deck or storage shed, accessory to a single-
family residence not exceeding 400 square feet in gross
floor area nor 12 feet in height. Before a permit may be
issued pursuant to this Section, the owner shall do all of
the following:
1. If required by the Building Official, submit an
engineering geology and/or soils engineering
report or reports that contain(s), at a minimum, a
qualitative and/or conditional finding that the
proposed work complies with the provisions of
Section 110.2.1.
2. Record in the office of the Department of Regis-
trar -Recorder a statement by the owner acknowl-
edging that the owner is aware that the records of
the Building Official indicate that the property is
potentially subject to hazard from landslide, set-
tlement, or slippage.
3. Record in the office of the Department of Regis-
trar -Recorder an agreement relieving the County
and all officers and employees thereof of any lia-
2017 COUNTY OF LOS ANGELES BUILDING CODE
2016 CALIFORNIA BUILDING CODE 21
ADMINISTRATION
bility for any damage or loss which may result
from issuance of such a permit. This agreement
shall provide that it is binding on all successors in
interest of the owner and shall continue in effect
until the Building Official records in the office of
the Department of Registrar -Recorder a state-
ment that the Building Official has determined
that such hazard from landslide, settlement, or
slippage no longer exists.
110.2.3.8 When the Building Official determines that
the hazard from landslide, settlement or slippage is
based solely on the fact that the area has been identified
as a potentially liquefiable area in a seismic hazard
zone (pursuant to Public Resources Code Section 2690
et seq.) and a foundation investigation is performed in
connection with the work in accordance with Section
1803 of this Code.
110.2.3.9 Notwithstanding any other provisions of this
Section, the Building Official may, at his or her discre-
tion, deny a permit for any building, structure or grad-
ing subject to a hazard from landslide, settlement, or
slippage which cannot be mitigated and may endanger
the health or safety of the occupants, adjoining property
or the public.
110.2.3.10 When the proposed work involves the repair
and restoration of a slope. Before a permit may be
issued pursuant to this Section, the owner shall submit
an engineering geology and/or soils engineering report
or reports that contain(s) the following:
1. A description and analysis of the existing condi-
tions, including the cause or causes of the failed
slope.
2. Recommendations for the repair of the failed
slope.
3. A qualitative and/or conditional finding that the
proposed work complies with the provisions of
Section 110.2.1 of this Code.
4. An analysis demonstrating that future failures
originating from the repaired portion of the slope
will not impact previously permitted structures.
5. An ' analysis demonstrating that the proposed
work will improve existing slope stability.
110.2.3.11 When the proposed work involves a minor
alteration or repair to an existing Group R-3 Occupancy
building and/or its accessory structures. Minor alter-
ations and repairs shall include the following:
1. Roof mount ' photovoltaic solar systems that
impose no more than 5 percent gravity load
increase to the existing building.
2. Ground mount photovoltaic solar systems.
3. Recovering and reroofings.
4. New and replacement mechanical and plumbing
equipment.
5. Window change -outs.
6. Similar work as determined by the Building Offi-
cial.
110.3 Fills containing decomposable material. Permits
shall not be issued for buildings or structures regulated by
this Code within 1,000 feet (304.8 m) of fills containing rub-
bish or other decomposable material unless the fill is isolated
by approved natural or artificial protective systems or unless
designed according to the recommendation contained in a
report prepared by a licensed civil engineer. Such report shall
contain a description of the investigation, study and recom-
mendation to minimize the possible intrusion, and to prevent
the accumulation of explosive concentrations of decomposi-
tion gases within or under enclosed portions of such building
or structure. At the time of the final inspection, the civil engi-
neer shall furnish a signed statement attesting that the build-
ing or structure has been constructed in accordance with the
civil engineer's recommendations as to decomposition gases
required herein:
Exception: When approved by the Building Official, miti-
' gation of decomposition gases shall not be required for
additions to single-family dwellings not exceeding 400
square feet in gross floor area and/or alterations to single-
family dwellings.
Buildings or structures regulated by this Code shall not be
constructed on fills containing rubbish or other decomposable
material unless provision is made to prevent damage to struc-
ture, floors, underground piping and utilities due to uneven
settlement of the fill. One-story, detached light -frame acces-
sory structures not intended or used for human occupancy
and not exceeding 400 square feet (37.2 m2) in area nor 12
feet (3658 mm) in height may be constructed without special
provision for foundation stability.
110.'�Methane gas hazards. Permits shall nbt»e issued for
new buildings or enclosed structures regulatefby this Code
on, adjace to, or within 300 feet (91.44 m)/of active, aban-
doned or idl oil or gas well(s) unless desi led according to
recommendatio s contained in, a reportyprepared by a regis-
tered design pro essional, such as a licensed civil engineer
and/or a licensed •etroleum engineer, to evaluate whether
such wells are bein properly operat&i/or maintained, or are
abandoned. No perms shall be issued until documentation of
proper operation, mar enance, or/ abandonment or reaban-
donment is submitted to . nd approved by the Building Offi-
cial.
Exceptions:
1. When approved by t f Building Official, mitigation
of methane gas h?z. i s shall not be required for
additions or altq/ratio to existing buildings or
structures located no do •r than 200 feet (60.96 m)
to active, abancloned or id . oil or gas well(s).
2. Grading perm/ts may be issu
work is necessary to mitigate
ard.
As used in tlf'is Section, "well" shall m; an any well as
defined by Sectfo)3008, Subdivisions (a), (b and (c) of the
California Publi4' Resources Code.
when the proposed
e methane gas haz-
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2017 COUNTY OF LOS ANGELES BUILDING CODE
2016 CALIFORNIA BUILDING CODE
ADMINISTRATION
110.5 Conditional use. Work required by this Section as a
condition for the use of the site shall be performed prior to the
connection of the utilities or occupancy of the building.
SECTION 111
ENGINEERING GEOLOGY AND SOILS
ENGINEERING REPORTS
The Building II tci. m. icquut err engineering geology or
soils engineering report, or both, where in the Building Offi-
cial's opinion, such reports are essential for the evaluation of
the safety of the site. The engineering geology or soils engi-
neering report, or both, shall contain a finding regarding the
safety of the site of the proposed work against hazard from
landslide, settlement or slippage and a finding regarding the
effect that the proposed building or grading construction will
have on the geotechnical stability of the area outside of the
proposed work. Any engineering geology report shall be pre-
pared by a certified engineering geologist licensed in the
State of California. Any soils engineering report shall be pre-
pared by a civil engineer, licensed in the State of California
and experienced in the field of soil mechanics, or a geotechni-
cal engineer licensed in the State of California. When both an
engineering geology and soils engineering report are required
for the evaluation of the safety of a building site, the two
reports shall be coordinated before submission to the Build-
ing Official.
SECTION 112
EARTHQUAKE FAULT MAPS
•
Earthquake Fault Zone Maps within the County of Los Ange-
les prepared under Sections 2622 and 2623 of the California
Resources Code which show traces of earthquake faults are
hereby declared to be, on the date of official issue, a part of
this Code, and may be referred to elsewhere in this Code.
Earthquake Fault Zone Maps revised under the above sec-
tions of the California Resources Code shall, on the date of
their official issue, supersede previously issued maps which
they replace.
Copies of each of the above maps shall be available for
examination by the public at the Department of Public
Works, Department of Regional Planning and the Executive
Office of the Board of Supervisors.
SECTION 113
EARTHQUAKE FAULTS
113.1 General. The construction of a building or structure
near a known active earthquake fault and regulated by this
Code shall be perrnitted as set forth in this Section.
113.2 Scope. The provisions of this Section shall apply only
to permits for buildings or structures on individual lots or par-
cels and are not intended to be supplementary to geologic
investigations required to qualify divisions of land as set forth
in Title 21 of the Los Angeles County Code, the Subdivision
Code.
113.3 Definition. For the purpose of this Section, a geologist
shall be a professional geologist, licensed by the California
State Board for Geologists and Geophysicists to practice
geology in California.
113.4 Known active earthquake faults. For the purpose of
this Section, known active earthquake faults are those faults
which have had displacement within Holocenetime (approxi-
mately the last 11,000 years) as defined in the most current
issue of Special Publication 42 of the California Geological
Survey.
113.5 Construction limitations. No building or structure
shall be constructed over or upon the trace of a known active
earthquake fault which is shown on maps maintained by the
Building Official. These maps include, but are not limited to,
Earthquake Fault Zone Maps prepared under Sections 2622
and 2623 of the California Public Resources Code.
The absence of a known active earthquake fault trace at
the proposed building location shall be determined by a pro-
fessional geologist licensed in the State of California in the
following cases:
1. When the proposed building is within 50 feet (15.24 m)
of that line designated by the Building Official as the
assumed location of a known active earthquake fault on
the aforementioned maps.
2. When the proposed building is within 50 feet (15.24 m)
of the most probable ground location of the trace of a
known active earthquake fault shown on the aforemen-
tioned maps.
In these cases the Building Official may require the exca-
vation of a trench, for the purpose of determining the exis-
tence of an active earthquake fault. Such a trench will be
required if a lack of distinguishable fault features in the vicin-
ity prevents the Building Official from determining by a site
examination, review of available aerial photographs, or by
other means that the fault trace does not underlie the pro-
posed building. The trench shall be approximately perpendic-
ular to the most probable direction of the fault trace, at least
1'/2 feet (457 mm) wide, and at least 5 feet (1524 mm) in
depth measured from natural grade, or to a depth satisfactory
to the Building Official.
The trench must be accessible for mapping and inspection
by the Building Official, when requested, and meet the
requirements of Title 8 of the California Code of Regulations,
Construction Safety Orders. The trench need not extend fur-
ther than the full width of the proposed structure plus 5 feet
(1524 mm) beyond the traversed exterior walls. A known
active earthquake fault shall be presumed nonexistent if air
exposure is not found by the professional geologist in the
walls or floor,of the trench.
The Building Official may require a more extensive inves-
tigation by a professional geologist as evidence to the
absence of a known active earthquake fault prior to the issu-
ance of a permit for Groups A, E, I, H and R-1 Occupancies
and B, F, M and S Occupancies over one story in height.
The results of the investigation, conclusions and recom-
mendations shall be presented in a geology report prepared
by a professional geologist as defined by Section 113.3. The
report shall comply with the guidelines presented in Note 49
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2017 COUNTY OF LOS ANGELES BUILDING CODE
2016 CALIFORNIA BUILDING CODE
23
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